1. n. A long, narrow channel or depression; e.g., such a slot cut into a hard material to provide a location for an engineering component, a tyre groove, or a geological channel or depression.
2. n. A fixed routine.
3. n. The middle of the strike zone in baseball where a pitch is most easily hit.
4. n. A pronounced, enjoyable rhythm.
5. n. (mining) A shaft or excavation.
6. v. To cut a groove or channel in; to form into channels or grooves; to furrow.
7. v. (intransitive) To perform, dance to, or enjoy rhythmic music.
I was just starting to groove to the band when we had to leave.